高弹性、柔软、透明的粘弹性薄膜，具有良好的可恢复性，适用于柔性显示,ACS Applied Materials & Interfaces

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高弹性、柔软、透明的粘弹性薄膜，具有良好的可恢复性，适用于柔性显示
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-08-10 , DOI: 10.1021/acsami.2c11141
Yuwei Fang ₁ , Jianhui Xia ₁

Affiliation

柔性电子设备的进步促进了显示应用的新材料开发。对于柔性显示器，合适的透明粘弹性膜 (CVF) 对于粘合显示器叠层中的不同层是必不可少的，以提高重复折叠过程中的可视性和耐用性。然而，通过克服许多相互矛盾的要求，例如低模量/玻璃化转变温度_（Tg) 和高附着力或高恢复性和良好的应力松弛。在这项工作中，使用具有双峰链长分布的互穿聚合物网络 (IPN) 制备了 CVF，它表现出多种良好的性能。双峰弹性体由短链聚氨酯（PU）和长链聚丙烯酸酯组成。长链聚丙烯酸酯网络提供了大量的缠结，赋予了可拉伸性、粘附性和应力松弛，而短链 PU 链网络充当了熵弹簧，主要贡献了可恢复性。实验数据表明两个网络之间存在氢键相互作用和互锁的聚合物链。当调整 IPN 的组件时，CVF 可以同时实现良好的应力松弛，大应变下的高应变恢复 (1000%)、高韧性、透明度和附着力。此外，CVF 显示出低玻璃化转变温度（-57 °C）和低储能模量（室温下为 20 至 30 kPa）。据我们所知，这是第一份使用 IPN 概念来制备具有良好平衡特性的 CVF 的报告。

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Highly Stretchable, Soft, and Clear Viscoelastic Film with Good Recoverability for Flexible Display

The advancement of flexible electronic devices has prompted new material development for the display application. For flexible display, a suitable clear viscoelastic film (CVF) is essential to bond different layers in a display stack in order to improve the visualization and durability during the repeated folding process. However, it is challenging to integrate different properties in the CVF by overcoming many contradictory requirements, such as low modulus/glass transition temperature (T_g) and high adhesion or high recoverability and good stress–relaxation. In this work, a CVF was prepared using an interpenetrating polymer network (IPN) with bimodal chain length distribution, and it exhibited several favorable properties. The bimodal elastomer was composed of short-chain polyurethane (PU) and long-chain polyacrylate. The long-chain polyacrylate network provided a large amount of entanglement that conferred stretchability, adhesion, and stress–relaxation, whereas the short PU chain network acted as an entropy spring and contributed mostly to the recoverability. The experimental data suggested the presence of a hydrogen-bonding interaction and interlocked polymer chains between the two networks. When the components of the IPN are adjusted, the CVF can simultaneously achieve good stress–relaxation, high strain recovery at large strain (1000%), high toughness, clarity, and adhesion. Moreover, the CVF displayed low glass transition temperature (−57 °C) and low storage modulus (20 to 30 kPa at room temperature). To the best of our knowledge, this is the first report using the IPN concept to prepare a CVF with well-balanced properties.

更新日期：2022-08-10

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